Received Data Error or Not Correct

[JAICHANGPARK]

Import

import 'package:roslibdart/roslibdart.dart' as roslib;

Topic

• msg_type: type: "std_msgs/UInt8MultiArray",

backpackTopic = roslib.Topic(
          ros: ros,
          name: '/topic/button/backpack',
          type: "std_msgs/UInt8MultiArray",
          reconnectOnClose: true,
          queueLength: 10,
          queueSize: 10);

Error

App Side

I/flutter (12948): {"layout":{"dim":[{"label":"btn_lt_0","size":1,"stride":0},{"label":"btn_lt_1","size":1,"stride":0},{"label":"btn_rt_0","size":1,"stride":0},
{"label":"btn_rt_1","size":1,"stride":0}],"data_offset":0},
"data":"AQAAAA=="}

Flutter Error

 [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: type 'String' is not a subtype of type 'List<dynamic>?' in type cast

host machine

• topic echo

layout:
  dim:
  - label: btn_lt_0
    size: 1
    stride: 0
  - label: btn_lt_1
    size: 1
    stride: 0
  - label: btn_rt_0
    size: 1
    stride: 0
  - label: btn_rt_1
    size: 1
    stride: 0
  data_offset: 0
data:
- 1
- 0
- 0
- 0
---

[tmtong]

I would use string as type rather than some complicated type like uintmultiarray. Then transform that string, which is in json format , back to whatever structure you need .

[JAICHANGPARK]

@tmtong
I changed uint8multiarray to int8multiarray

It's works fine
Thanks